Navitech Car Windscreen Suction Mount Ball for Garmin Nuvi 850, Nuvi 855, Nuvi 880, Nuvi 885t, Nuvi 1200, Nuvi 1250, Nuvi 1260t, Nuvi 1300, Nuvi 1350, Nuvi 1350t, Nuvi 1370t, Nuvi 1390t, Nuvi 1490t, Nuvi 1690, Nuvi 1690t Full Clip and Lock System to windscreen full ultimate hold (up to 7kg in weight) 362 degree strudy operational head to your Garmin (Does not include Mounting head, please transfer from your existing Garmin) The ball joint is 17mm in diameter Fully under a 12 month warranty